Ultraviolet -- Far-infrared Spectral Energy Distributions of Quasars and Active Galaxies.

Details Ultraviolet -- Far-infrared Spectral Energy Distributions of Quasars and Active Galaxies. Ultraviolet -- Far-infrared Spectral Energy Distributions of Quasars and Active Galaxies.

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5819w&link_type=abstract

HST Proposal ID #5819

Physics

Hst Proposal Id #5819 Agn

Scientific paper

We have been allocated 70 hours of spacecraft time on the Infrared Space Observatory to obtain far-infrared {IR, 4-200 Mum} photometry of 140 quasars and active galaxies {AGN} selected to cover the full range of continuum properties and redshift known to be present in the parent population. These data will, for the first time, provide us with far-infrared continuum observations of a large and representative sample of quasars and AGN. With this sample we will be able to make the first detailed study of the relative importance of dust and non-thermal processes in generating the IR emission. Current, small and strongly-biassed samples indicate dust in radio- quiet and non-thermal in radio-loud quasars, but no representative sample is available for a full investigation. Since quasars and AGN emit roughly equal energy throughout the far-IR-X-ray spectral range, multi-wavelength data are essential to investigate the energy generation mechanism{s} involved and in particular the relation of the far-IR emission to the remainder of the spectral energy distribution {SED}. In order to take full advantage of our unique far-IR dataset, we propose to analyse all available archival HST data which will, in combination with planned/already available ground-based optical and near-IR data, determine the IR-ultraviolet {UV} SEDs. For about half the sample, X-ray data are also available.

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